package chapter10.demo1;

import java.sql.*;
import java.util.Scanner;

public class demo1 {
    public static void main(String[] args) throws SQLException{
        /*
         * 模拟添加用户业务
         */
        Statement stmt = null;
        ResultSet rs = null;
        Connection conn = null;
        try {
            // 1.注册数据库而的驱动
            Class.forName("com.mysql.cj.jdbc.Driver");
            // 2.通过DriverManager获取数据库连接
            String url = "jdbc:mysql://localhost:3306/jdbc?serverTimezone=GMT%2B8&useSSL=false";
            String username = "root";//数据库账户
            String password = "12345678";
            conn = DriverManager.getConnection(url, username, password);
            // 3.通过Connection对象获取Statement对象
            stmt = conn.createStatement();
            // 4.使用Statement执行SQL语句。
            /*
             * 终端用户输入用户名 密码 邮箱
             * 将终端用户的输入添加到数据库
             */
            Scanner sc = new Scanner(System.in);
            System.out.println("请输入用户名:");
            String un = sc.next();
            System.out.println("请输入用户密码:");
            String pd = sc.next();
            System.out.println("请输入用户邮箱:");
            String em = sc.next();
            String insertSQL ="insert into users(name,password,email) values(?,?,?)";
            PreparedStatement pstmt = conn.prepareStatement(insertSQL);//对插入sql进行处理了
            pstmt.setString(1, un);// 将SQL第一个?号绑定成un的值
            pstmt.setString(2, pd);// 将SQL第一个?号绑定成pd的值
            pstmt.setString(3, em);// 将SQL第一个?号绑定成em的值
            pstmt.executeUpdate();
            String sql = "select * from users";
            rs = stmt.executeQuery(sql);
            // 5.操作ResultSet结果集
            System.out.println("id  |  name  |  password "+"|  email |  birthday  ");
            while (rs.next()) {
                int id = rs.getInt("id");//通过列名获取指定字段的值
                String name = rs.getString("name");
                String psw = rs.getString("password");
                String email = rs.getString("email");
                String birthday = rs.getString("birthday");
                System.out.println(id + " | " + name + " | " + email + " | " + birthday);
            }
        } catch(ClassNotFoundException e){
            e.printStackTrace();
        }finally {
            // 6.回收数据库资源
            if (rs != null) {
                try {
                    rs.close();
                }catch (SQLException e) {
                    e.printStackTrace();
                }
                rs = null;
            }
            if (stmt != null) {
                try {
                    stmt.close();
                }
                catch (SQLException e) {
                    e.printStackTrace();
                }
                stmt = null;
            }
            if (conn != null) {
                try {
                    conn.close();
                }
                catch (SQLException e) {
                    e.printStackTrace();
                }
                conn = null;
            }
        }
    }
}
